tell us. >> reporter: moore's maintained all along she's innocent. but the 40-year-old is now charged with first-degree murder, facing a mandatory sentence of life in prison. prosecutors paint a picture of moore as a conniving manipulator. intent on taking shakespeare's cash. first, she tried to convince shakespeare's mother, elizabeth walker, that her son was still alive. just missing. orchestrating a phone call with someone claiming to be her son. >> he said, it's abraham. and i said, you don't sound like abraham. >> reporter: then, her ex-husband, james, testified he dug a hole with a backhoe and covered it up at his former wife's request. >> pay attention to what was in the hole? >> no, sir. >> before you filled it? >> no, sir. >> reporter: but the prosecution's star witness is greg smith, turned police informant. in secretly taped conversations, moore is heard spinning an elaborate web of lies. yesterday, smith describes the pains moore allegedly took to write a letter to shakespeare's mother, as if it was her son, who happened to be illiterate.